Be the first to measure and contribute air quality data to your community
Air Quality 
Air Monitors
Air Purifiers
For Business
News
Support
Air quality in Ontario
Air quality index (AQI) and PM2.5 air pollution in Ontario
35 people follow this city
Ontario Air Quality Map
Real-time Ontario air pollution map
AIR QUALITY DATA SOURCE
* AQI modeled using satellite data Learn more
Pollen
What is the pollen count in Ontario today?
 | Index | Very high | |
 | Tree pollen | Very high | |
 | Grass pollen | Low | |
 | Weed pollen | None |
Source: tomorrow.io
Weather
What is the current weather in Ontario?
| Weather | Scattered clouds |
| Temperature | 55.4°F |
| Humidity | 73% |
| Wind | 16.1 mp/h |
| Pressure | 30.1 Hg |
live aqi city ranking
Real-time USA city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Oklahoma City, Oklahoma | 87 |
| 2 | Edmond, Oklahoma | 82 |
| 3 | San Antonio, Texas | 74 |
| 4 | Boerne, Texas | 69 |
| 5 | Corpus Christi, Texas | 66 |
| 6 | Lawrence, Kansas | 66 |
| 7 | Leavenworth, Kansas | 66 |
| 8 | Tulsa, Oklahoma | 66 |
| 9 | Kansas City, Missouri | 62 |
| 10 | The Woodlands, Texas | 61 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
US AQI
18*
live AQI index
Good
Overview
What is the current air quality in Ontario?
| Air pollution level | Air quality index | Main pollutant |
|---|---|---|
| Good | 18* US AQI | PM2.5 |
| Pollutants | Concentration | |
|---|---|---|
| PM2.5 | 4.3*µg/m³ | |
✓
PM2.5 concentration in Ontario air currently meets the WHO annual air quality guideline value
Health Recommendations
What is the current air quality in Ontario?
 | Enjoy outdoor activities |
 | Open your windows to bring clean, fresh air indoors GET A MONITOR |
Forecast
Ontario air quality index (AQI) forecast
| Day | Pollution level | Weather | Temperature | Wind |
|---|---|---|---|---|
| Today | Good 18 AQI US |  90% | 55.4° 41° |  17.9 mp/h |
| Sunday, Apr 28 | Good 38 AQI US | 100% | 60.8° 50° | 13.4 mp/h |
| Monday, Apr 29 | Good 33 AQI US | 100% | 50° 41° | 13.4 mp/h |
| Tuesday, Apr 30 | Good 50 AQI US | 100% | 53.6° 42.8° | 8.9 mp/h |
| Wednesday, May 1 | Good 42 AQI US | | 51.8° 42.8° | 6.7 mp/h |
| Thursday, May 2 | Moderate 69 AQI US  | | 69.8° 46.4° | 15.7 mp/h |
| Friday, May 3 | Moderate 67 AQI US | 100% | 66.2° 57.2° | 15.7 mp/h |
Interested in hourly forecast? Get the app
News
The latest air quality news and resources.
Where is the cleanest air quality in Ontario?
No locations are available.
AQI US, Metric